d3bb5d1e创建于 2025年7月7日历史提交

JSVM-API常见问题

定位方法

程序崩溃类问题：通过C++崩溃时调用栈查询FAQ的方式定位代码问题

程序执行结果不符合预期类问题：需应用通过JSVM-API调用返回值定位到执行失败或执行结果不符合预期的位置，通过函数名查询FAQ

程序崩溃类

Q：在OH_JSVM_RunScript或OH_JSVM_CallFunction时crash，调用栈顶层为SetReturnValue

#00 pc 0000000000c68ef0 /system/lib64/ndk/libjsvm.so(v8impl::(anonymous namespace)::FunctionCallbackWrapper::SetReturnValue(JSVM_Value__*)+16)
#01 pc 0000000000c5ad30 /system/lib64/ndk/libjsvm.so(v8impl::(anonymous namespace)::FunctionCallbackWrapper::Invoke(v8::FunctionCallbackInfo<v8::Value> const&)+332)
#02 pc 00000000014a9e58 /system/lib64/ndk/libjsvm.so
#03 pc 00000000014a95d4 /system/lib64/ndk/libjsvm.so(v8::internal::Builtin_HandleApiCall(int, unsigned long*, v8::internal::Isolate*)+176)
#04 pc 0000000000f7dab4 /system/lib64/ndk/libjsvm.so(Builtins_CEntry_Return1_ArgvOnStack_BuiltinExit+84)
#05 pc 0000000000eece40 /system/lib64/ndk/libjsvm.so(Builtins_InterpreterEntryTrampoline+288)
#06 pc 0000000000eece40 /system/lib64/ndk/libjsvm.so(Builtins_InterpreterEntryTrampoline+288)
#07 pc 0000000000eece40 /system/lib64/ndk/libjsvm.so(Builtins_InterpreterEntryTrampoline+288)
#08 pc 0000000000eece40 /system/lib64/ndk/libjsvm.so(Builtins_InterpreterEntryTrampoline+288)
#09 pc 0000000000eece40 /system/lib64/ndk/libjsvm.so(Builtins_InterpreterEntryTrampoline+288)
#10 pc 0000000000eece40 /system/lib64/ndk/libjsvm.so(Builtins_InterpreterEntryTrampoline+288)
#11 pc 0000000000eece40 /system/lib64/ndk/libjsvm.so(Builtins_InterpreterEntryTrampoline+288)
#12 pc 0000000000eece40 /system/lib64/ndk/libjsvm.so(Builtins_InterpreterEntryTrampoline+288)
#13 pc 0000000000fe09f4 /system/lib64/ndk/libjsvm.so(Builtins_PromiseFulfillReactionJob+52)
#14 pc 0000000000f155c0 /system/lib64/ndk/libjsvm.so(Builtins_RunMicrotasks+672)
#15 pc 0000000000eeab54 /system/lib64/ndk/libjsvm.so(Builtins_JSRunMicrotasksEntry+148)
#16 pc 00000000015bed78 /system/lib64/ndk/libjsvm.so(v8::internal::(anonymous namespace)::Invoke(v8::internal::Isolate*, v8::internal::(anonymous namespace)::InvokeParams const&)+2520)
#17 pc 00000000015bf50c /system/lib64/ndk/libjsvm.so(v8::internal::(anonymous namespace)::InvokeWithTryCatch(v8::internal::Isolate*, v8::internal::(anonymous namespace)::InvokeParams const&)+104)
#18 pc 00000000015bf730 /system/lib64/ndk/libjsvm.so(v8::internal::Execution::TryRunMicrotasks(v8::internal::Isolate*, v8::internal::MicrotaskQueue*)+80)
#19 pc 00000000015ecf4c /system/lib64/ndk/libjsvm.so(v8::internal::MicrotaskQueue::RunMicrotasks(v8::internal::Isolate*)+312)
#20 pc 00000000015ecd9c /system/lib64/ndk/libjsvm.so(v8::internal::MicrotaskQueue::PerformCheckpointInternal(v8::Isolate*)+52)
#21 pc 00000000015deaa0 /system/lib64/ndk/libjsvm.so(v8::internal::Isolate::FireCallCompletedCallbackInternal(v8::internal::MicrotaskQueue*)+280)
#22 pc 00000000014334e8 /system/lib64/ndk/libjsvm.so(v8::CallDepthScope<true>::~CallDepthScope()+248)
#23 pc 00000000014330a4 /system/lib64/ndk/libjsvm.so(v8::Script::Run(v8::Local<v8::Context>, v8::Local<v8::Data>)+884)
#24 pc 0000000000c5c2ac /system/lib64/ndk/libjsvm.so(OH_JSVM_RunScript+272)

A：SetReturnValue用于设置js函数的返回值，在js完成注入的native函数调用后触发。需检查native函数的返回值是否正确，如返回值（类型JSVM_Value）是否未初始化就直接返回。

Q：js执行虚拟机初始化注入的native函数时程序崩溃

A：检查JSVM_CallbackStruct是否为栈上变量，跨函数使用时需保证JSVM_CallbackStruct生命周期 >JSVM_Env的生命周期

func {
	// ...
    JSVM_CallbackStruct param[] = {
        {.data = nullptr, .callback = ConsoleInfo},
        {.data = nullptr, .callback = Add},
    };
    JSVM_PropertyDescriptor descriptor[] = {
        {"consoleinfo", NULL, &param[0], NULL, NULL, NULL, JSVM_DEFAULT},
        {"add", NULL, &param[1], NULL, NULL, NULL, JSVM_DEFAULT},
    };
    // create env, register native method, and open env scope
    JSVM_Env env;
    OH_JSVM_CreateEnv(vm, sizeof(descriptor) / sizeof(descriptor[0]), descriptor, &env);
   // ...
    OH_JSVM_DestroyEnv(env);
   // ...
}

样例中的代码结构如上，JS引擎实例在函数结束前被关闭，所以可以直接使用栈上的param。

Q：OH_JSVM_ReferenceRef、OH_JSVM_ReferenceUnRef、OH_JSVM_CreateReference、OH_JSVM_DeleteReference时程序崩溃

A：检查是否同时有多个线程持有和释放JSVM_Ref，见多线程共享引擎实例

Q：在虚拟机引擎实例中创建JS类型实例崩溃（如OH_JSVM_CreateDouble），调用栈如下

#00 pc 0000000001d209e4/system/lib64/ndk/libjsvm.so(v8::base::0S::Abort()+28)
#01 pc 0000000001408480/system/lib64/ndk/libjsvm.so(v8::Utils::ReportApiFailure(char const*,char const*)+124)
#02 pc 00000000015c99b8/system/lib64/ndk/libjsvm.so(v8::internal::HandleScope::Extend(v8::internal::Isolate*+200)

A：检查HandleScope的使用是否正确，见生命周期管理

JSVM-API执行失败类

Q：OH_JSVM_GetCbInfo的无法获取JS函数参数

A：检查函数传递的参数是否正确，见获取JS传入参数及其数量
Q：OH_JSVM_CreateFunction等函数调用失败，返回值为JSVM_PENDING_EXCEPTION

A：JSVM_PENDING_EXCEPTION表明当前虚拟机环境中存在未处理的异常，可能是由于本次调用产生的JS异常，也可能是之前调用产生的未被清理的异常。可以通过在函数调用前插入OH_JSVM_GetAndClearLastException排查之前是否有未清除的异常。如果为之前的未清理异常，检查是否有JSVM接口调用未处理异常返回值；如果为本次产生的异常，需清理异常，避免影响后续的函数调用。获取并清理异常的函数为OH_JSVM_GetAndClearLastException
Q：JS执行时无法找到 OH_JSVM_DefineClass 定义的类

A：检查是否将定义的类绑定到上下文中，见上下文绑定对象